Puanooraph co



CARL WINKLER, OF BERNE, SWITZERLAND.

IMPRESSION-CYLINDER FOR PRINTING-MACHINES.

Specication of Letters Patent.

Patented Aug. 26, 1919.

Application led .Tune 26, 1918. Serial No. 242,063.

To all whom t may concern Be it known that I, CARL WINKLER, a citizen ofthe Swiss Republic, residing at Berne, in the Swiss Republic, haveinvented a new and useful Improved Impression-Cylinder forPrinting-Machines, of which the following is a specification.

In the design of modern printing machines, particularly of machineshaving a reciprocating type-carriage, continual efforts are being madeso to strengthen and stiden the parts which are normally and especiallysubject to strains and distortion during the time printing is inprogress, that good and exact prints are obtained for the duration ofthe entire life of the machine. Hitherto attention has chieiy been paidto the proper construction of the side frames, cross frames andunder-frames. With that end in view certain parts have been reinforcedor strengthened so that the strains are better distributed and improvedprinting results are obtained. The impression cylinder was, however,liable to be badly affected by such measures, because the strains weremore concentrated on the same, and after some time it became impossibleto obtain good prints.

The object of the present invention is to overcome or avoid thesedrawbacks, the main purpose of the invention being so to strengthen theimpression cylinder, in addition to the side and transverse frames, thatthe resistance to bending or distortion reaches a maximum. For thispurpose the impression cylinder is so constructed, aocording to thepresent invention, that the longitudinal ribs or webs inside the samehave a width which corresponds with the inside diameter, and a lengthcorresponding with the entire length, of the cylinder. Owing to the factthat the cylinder-rim, the transverse and longitudinal ribs, and thetrunnions can all Ibe cast in one piece, the

cylinder is rendered considerably stronger and more durable.

In the annexed drawing one form of carrying out the invention isillustrated by way of example.

Figure 1 is a longitudinal section of the impression cylinder on theline 1 1 of Fig. 2.

Fig. 2 is a cross section on the line 2 2 0f Fig. l.

Fig. 3 shows the cylinder in elevation and Fig. 4 is an end view of thesame.

As will be seen from the drawings, the longitudinal ribs a are radiallyarranged and meet together at the axis of the4 cylinder; they thusconnect the .outside walls b c (l of the impression cylinder both in aradial and a longitudinal direction. Further, it is evident that theseribs can be made without apertures or openings and that the longitudinaland transverse ribs a', cylinder end walls, cylinder rim and trunnionsare capable of being made in one piece.

What I claim and desire to secure by Letters Patent of the United Statesisz- 1. An impression cylinder for printing machines comprising an axis,end walls and radially disposed internal longitudinal ribs, mergingintegrally with said axis, said ribs integral with the cylinder and endwalls and extending uninterruptedly from end wall to end wall.

2. An impression cylinder for printing machines including a shell, endwalls, axis and trunnions cast integral and longitudinal internalimperi'orate ribs radially disposed and merging with said axis and endwalls.

In testimony whereof I have signed my naine to this specification in thepresence of two subscribing witnesses.

CARL WINKLER.

Witnesses:

O. MURBACH, H. J. STEBLIN.'

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C.

